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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($)
$ in Thousands, shares in Millions
2 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Principal amount of long-term debt   $ 669,470 $ 416,466
Unamortized discount and deferred financing costs   27,049 23,826
Long-term debt   $ 642,421 392,640
5.00% Convertible Senior Notes due 2021      
Debt Instrument [Line Items]      
Debt instrument, interest rate   5.00%  
5.00% Convertible Senior Notes due 2021 | Carrying Value      
Debt Instrument [Line Items]      
Long-term debt   $ 72,600  
Convertible Debt | 5.00% Convertible Senior Notes due 2021      
Debt Instrument [Line Items]      
Debt instrument, interest rate   5.00%  
Principal amount of long-term debt   $ 79,895 $ 115,000
Unamortized discount and deferred financing costs   7,300  
Repurchased face amount $ 35,100    
Repurchased amount in cash $ 16,200    
Repurchased amount, shares (in shares) 1.4    
Repurchase amount, fair value $ 30,100    
Gain (loss) on extinguishment of debt   $ (3,700)